I'm amazed that no one has mentioned taxi receipts. In 90% of the cases you ask for a receipt and the taxi driver hands you a blank receipt. You put what ever you want in the amount field. Luckily the company I work for doesn't have an official travel policy and I've never had an expense turned down so there is no reason for me to pad the taxi receipt. I also value the trust and integrity that I have earned with the company over the years so I would never do anything to tarnish that.

However, I have a colleague at the office who hates filling out expense reports for smaller cash items like coffee, parking meters, road tolls, fast food lunches, etc. He just divides the total cash amount that he spent during the trip by the number of taxi receipts that has and writes down that amount on each receipt. My company has never had a problem with it and it makes his expense reports much shorter.

After reading some of some of the restrictive travel policies of some companies I am grateful to be working for the company I do.